Dental-engine bracket



' f W1 TNESSES: I By f e. I

0. H. AND A. F. PIEPER.

DENTAL ENGINE BRACKET.

APPLICATION FILED NOV.12. 19]? 1,877,432, Patented May 10, 1921.

Im Ill- INVENTORS ATTORNEYS.

v drawings, forminga part of this spec1fica-.

end of the specification.

erative position;

U ITE ES PATENT over-CE.

foscAra n. rrnrnn AND ALPHoNsn F. rinrnn, on nocrrnsrna nnw Y RK I ENTAL-ENGINE BRACKET.

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P 9 f limiters latent Patented May 516, 1921. i

Original applicationfiled May 27, 1312,8eria1 No. 699,938. Divided and this application. filed November p 12, .1917. .Serial N0. 201,543. l i

To all whom it may concern:

Be it known that we, OSCAR H. Pmrnn' and \ALPHONSE Pmrnn, citizens of the United I States,both of Rochester, in the county of Monroe and State of New York, have inventedcertain new and useful Im-.

provementsin Dental-Engine Brackets; and we do hereby declare the following to be a full, clear, and exact description of the same,

reference being had to the accompanying tion, and tothe reference numerals marked thereon.

The prime object of-the invention is to afford a practicable and simply constructed I pulley guard of a type which is particularly adapted for dental engine brackets, involving pulleys for guiding a transmission, belt or cable leading from a driving motorto the hand piece. a 1 A furtherpurpose of our improvement is to provide a .com-

pact arrangement, with readily controlled means for removing the guard from operative relationship with'the pulleys, and retaining it either in its operative or inopera tive position; An additional object of the invention is to afford a connection between 7 different parts of a dental engine bracket,

to permit greater freedom of movement, and at the same timeprovide a5 structurethat is simple and entirely'eflicient in r a s practlcal way. To these and other ends the invention consists in'certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the- In the drawings: 1

Fgure 1 isa side elevation of aportion of. a. dental engine supporting. arm, with parts appearing in section, and showing the application of the improvements;

Fig. 4; is a plan view of the guard withdrawn from operative position, and r Fig. 5 is a detail view in elevation. Similar reference numerals n the several figures indicate the same parts.

This application is a division of an origi I nal application filed by us May 27, 1912,

Serial No. 699,938, and in the present embodiment, 1 designates generally a supporti swlnging movement axiallyof the-support ing arm, and to this end the hand'piece joint includes a central portion to which is fixed a rod {.t, and the latter extends throughan opening in the outer end of the supporting arm 1. Arranged upon the inner'end ofthe rod 1} is a limiting means, preferably in the the ,supportingarm and hand piece joint.

7 designates a stop arranged for enga ement Wlbh opposite faces 8 of the plate 5, d1

w to limit its movement in opposite directions.

Arranged upon the central portion 3 of the o nt 1s a pulley guard conslsting ofoppositely disposed guard p'ortionsfl9 "and la connectingbody "portion 10.: The guard ereby form of a plate 5, which is fixed upon the rod by a screw 6 and prevents separation of portions 9 are arranged to cooperate" with Q pulleys 11 disposed upon opposite sides of. the central portion 3 and mounted upon an arbor 12. The guard 15; arranged upon a supporting'pinl3 which'is movable in the recess 1-1 of the central portion. The guard and the'pin 13 are held normally in theirinnermost positions, as shown'in Figs. 1 and 3, by meanscof a1 spring 15;wh1ch engages the head 16 of thesupporting pin and acts f to retain the latter in the position 'shownin Fig; 1.

.The guard-can be withdrawn against the action of the spring 15, so as tobe removed access thereto and to the belt for adjustment order to retain in its outermost or inopertLtlVe positlon, it carrles a locking pm 17 which eoeperates with a reduced recess 18 when in its innermost position: Therecess .18 is preferably of just the size toreceive p the pin 17 and terminates at its outer end in Fig. 3 is aplan view of the. guard in opftoa' distance from the pulleys and permit y of the latter as may be necessary, and in an enlarged seat 19 which permits a limited wardly and turning it slightly about the axis of the supporting pin 13, the locking pin 17 is disengaged from therecess 18 and rests upon the bottom of the seat 19, as. hown inFigs. 2 and 4. a To restore the nationfof a supporting arm having a' recess guard to: normal position, a slight lateral movement is all that isnecessary, bringing, V the pin 17 into alinement withthe recess 18,

whereupon the spring restores the guard into operative relationship with the pulleyse 7 We claim as our invention: V V 1. In a dental engine bracket, the combitherein, a pulley r'ot'atably carried on said arm, a guard for said pulleyhaving a portion rotatably and slidably carried in said recess in the I arm, resilient means I tending to slide said guard portion insaid recess to maintain said guard in operative position 7 adjacent said pulley, and cooperating parts on said arm and guard whereby,rupon sliding and rotating said guard portionin said recess in opposition to said resilient means, said guard may be retained in inoperative position removed from saidpulley.

" 2. In a dental engine bracket, the combination of a supporting arm having a recess therein, a pulley rotatably carried on said i arm, a guard for said pulley comprising a arm andguard' for retaining the latter in inoperative position I brought into cooperating engagement by rotation of said guard nation with a supporting arm, of .a hand piece joint including a central portion pul 40 leys' disposed on opposite sides of saidcen- "pin in said recess after sliding saidfpin" f 35 therein to move the guardaway from the pulley.

3. In a dental engine bracket, the combi V tral portion, a supporting pin, a pulley guard mounted'onsaid supporting pin, the

pin; being movable in. a recess in the. central 7 portion, a spring arranged insaid recessand cooperating with said pin v to, V retain: the

.guard'in operative position, anda locking p in carried by the guard and cooperating with said central portion, when the'guard is withdrawn and turned, acting tohold in its outer or inoperative position.

i a 4. Ina dental engine bracket, the combination with a supporting arm, of a hand piece joint'including a central'portiompulleys disposed on. opposite'sides of said central portion, a supporting pin, a pulley guard mounted on said supporting pin, the

' pin being movable in a recess in the central portion, a springv arranged in said recess j and cooperating with sald pin to retainthe V guard in operative position, and alocking pin carried by the guard, said central portion having'a reduced recess to receive the locking pin when in its innermostposition and an enlarged seat for the locking-pin surround ng said recess at its outer end and thereof, said enlarged seat having a side wall which limits the lateral movement of:

the locking pin. 7 a V 5. Ina dental engine bracket, the combl- 651 serving to receive the end of thelocking f pinuand permit slight lateral movement nations-with a supporting arm, ota hand piece joint including a central portion,'pulleys disposed on opposite sides of said central portion, a supporting pin, a pulley guardmounted onsaid supportingfpin, the pin being movable'ln a recess'i'n' the Central portion; a spring i'arranged insaid recess and cooperating with said pinto retain the guard in' operative position, and a locking pin carried by the guard,said central portion having an enlarged seat to receive and permit limited lateral movement of the looking pin when in outermost position, and a reduced recess, at the center ofzsaid seat which receives the locking pin when in its innermost position. I A

' ;.'osoAR H; PIEPER. .Y j ALPHONSE F. PIEPER. 

